John mueller



J MUELLER.

ELECTRIC ARC LAMP.

(No Model.)

No. 602,404. Patented Apr. 12,1898.

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331g Zia 6 6 50114 I [us ca, PHOTO-LIT UNITED STATES PATENT Fines.

JOHN MUELLER, OF CLEVELAND, OHIO, ASSIGNOR TO THE DUPLEX HANGER COMPANY,OF SAME PLACE.

ELECTRIC-ARC LAM P.

SPECIFICATION forming part of Letters Patent No. 602,404, dated April12, 1898.

Application filed August 2'7, 1897. Serial No. 649,672. (No model.)

To all whom it may concern: the top by the upper plate B, with whichthey Be it known that I, JOHN MUELLER, a citimay be integral, and at thebottom are united zen of the United States, residing at Oleveby thecollar 0, through which passes the land, in the county of Ouyahoga andState of holder for the lower carbon.

Ohio, have invented certain new and useful D is a tube in which slidesthe holder d for Improvements in Arc-Lamps; and I do herethe uppercarbon, and 011 which holder is the by declare the following to be afull, clear, usual clamp e, fitted to slide smoothly thereon and exactdescription of the invention, such and provided with a projecting rim orarm 6 as Will enable others skilled in the art to with which thelifting-leverf engages to lift [0 which it appertains to make and usethe same. the clamp and holder,as hcreinafterdescribed.

My invention relates to improvements in The top plate 13 is providedwith the usual electric-arc lamps. binding-posts b l), insulatedtherefrom to The object of the invention is to increase which the maincircuitis connected, and may the efficiency of the lamp; and it consistsin also be provided with binding-posts or con- I5 the novel features ofconstruction, combinanections for any rheostat or shunt connectionstion, and arrangement of parts hereinafter desired, as b If The lowercarbon is confully described, and specifically pointed out nected, as byconductor 0, to the post I). To in the claim. the lower part of post I)is joined one end of In the drawings, Figure l is a view in eleathermo-expansive strip 72, whose other end 20 vation of an electric-arclamp constructed acis connected to one arm of a lever 2', pivotally 7ocording to my invention, and Fig. 2 is a like supported on, butinsulated from, the lamp- View of the lamp taken at right angles to theframe. A similar expansive strip 7L2 joins view shown in Fig. 1. Fig. 3is a detail showthe other end of lever 2' to one end of a crossing, on alarger scale, the feed-clamp and its lever j, pivoted on, but insulatedfrom, the

2 5 connections, &c. 3 and Figs. 4 and 5 show frame. To the other end oflever j a third variations of the arrangement of the strips. expansivestrip 713 is connected and joined to In electric-arc lamps wherein thefeedingone end of a lever 2' also pivoted to, but inclamp which liftsthe upper carbonis actuated sulated from, the lamp-frame, and the otherby the expansion and contraction of a thermoend of lever 2' is joined bya fourth expansive 3o expansive conductor or by the joint action ofstrip h to the lifting-lever f, pivoted on, but such conductor and aspring there has been insulated from, the frame. A spring Zactuexperienced great difficulty in securing at the ates the lever f insuch manner as to lift its same time sufficient delicacy of action and afree end f, which is adapted to engage the sufficient extent ofmovement, owing to the arm or collar 6 of clamp e. I

3 5 limitations in the size of the lamps, which are, The strips h h h3 hand levers 2', 2' and j are for commercial reasons, necessary. Attemptsso proportioned that when cold the free arm have been made to meet thisdifficulty by f of lever f will be depressed against the tencausing suchthermo-expansive strip to act sion of spring Z, so as to allow clamp etorest upon the short arm of a lever and to multiupon a fixed stop, as 70,and consequently the 40 ply the movement of this arm by giving theupper-carbon holder will by its gravity slide other arm an increasedlength; but this downward until the carbon rests upon the methodmultiplies the resistance also and has lower carbon. If current is nowturned on, proven, in practice, to be objectionable, as it will passthrough the strips h 7L h3 if and have all other attempts to overcomethis diffitheir connectinglevers to the holder d and 5 culty. throughthe carbons, and will by its passage 5 By the construction shown I have,after heat and expand the strips h 7t 71, 72 which much experimenting,finally overcome the will allow the spring Z to lift the arm f intodifficulty. contact with the rim 6 and as arm f continues In thedrawings, A A are the side bars of to lift it will tilt the clamp c andcause it to 50 the ordinary lamp-frame and are joined at lift the uppercarbon, thus forming the arc. 10o

As the increased resistance diminishes the quantity of current passingthe strips h 7L2, &c. contract and draw down the arm f, thus allowingthe carbon to descend and shorten the arc, whereupon the current throughthe expansive strips increases and expands them again, and thus thealternate expansions and contractions feed the carbon down steadily, soas to maintain an almost constant resistance at the arc and hence asteady light without flickering or hissing. So great is thesensitiveness of this device that one-third of the current will operateit which is required to operate the feed with a single expansive strip.

By the construction shown I obtain more than four times the length ofexpansive strip which is possible with a single strip, and I obtain aperfect regulation of the are, which has been found by repeated trialsto be impossible with the single strip.

IVhat I claim as my invention, and desire to secure by Letters Patent,is

In an arc-lamp the combination with the carbon-holding devices and afeeding-clamp having sliding engagement with the uppercarbon holder, ofa lifting-lever adapted to engage and lift said clamp, a spring actingon said lever to cause it to engage said clamp, a cross-lever pivoted onthe lamp-frame, auxiliary levers as L' 2' and thermo-expansive stripsconnecting the auxiliary levers respectively with the cross-lever andthe liftinglever, and with the cross-lever and a bindingpost to whichthe main circuit is connected, substantially as described.

In testimony whereof Ihereto affix my signature in presence of twowitnesses.

JOHN MUELLER.

Vitnesses:

L. J. RANDALL, LOREN PRENTISS.

